JDK14/Java14源码在线阅读
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jdk.hotspot.agent /
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classes /
sun /
jvm /
hotspot /
utilities /
ObjectReader.java
/*
* Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
package sun.jvm.hotspot.utilities;
import java.lang.reflect.Modifier;
import java.util.*;
import java.util.stream.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.oops.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.utilities.*;
/**
* ObjectReader can "deserialize" objects from debuggee.
*
* Class Loading:
*
* ObjectReader loads classes using the given class loader. If no
* class loader is supplied, it uses a ProcImageClassLoader, which
* loads classes from debuggee core or process.
* Object creation:
*
* This class uses no-arg constructor to construct objects. But if
* there is no no-arg constructor in a given class, then it tries to
* use other constructors with 'default' values - null for object
* types, 0, 0.0, false etc. for primitives. If this process fails to
* construct an instance (because of null checking by constructor or 0
* being invalid for an int arg etc.), then null is returned. While
* constructing complete object graph 'null' is inserted silently on
* failure and the deserialization continues to construct best-effort
* object graph.
*
* Debug messages:
*
* The flag sun.jvm.hotspot.utilities.ObjectReader.DEBUG may be set to
* non-null to get debug error messages and stack traces.
*
* JDK version:
*
* JDK classes are loaded by bootstrap class loader and not by the
* supplied class loader or ProcImageClassLoader. This may create
* problems if a JDK class evolves. i.e., if SA runs a JDK version
* different from that of the debuggee, there is a possibility of
* schema change. It is recommended that the matching JDK version be
* used to run SA for proper object deserialization.
*
*/
public class ObjectReader {
private static final boolean DEBUG;
static {
DEBUG = System.getProperty("sun.jvm.hotspot.utilities.ObjectReader.DEBUG") != null;
}
public ObjectReader(ClassLoader cl) {
this.cl = cl;
this.oopToObjMap = new HashMap();
this.fieldMap = new HashMap();
}
public ObjectReader() {
this(new ProcImageClassLoader());
}
static void debugPrintln(String msg) {
if (DEBUG) {
System.err.println("DEBUG>" + msg);
}
}
static void debugPrintStackTrace(Exception exp) {
if (DEBUG) {
StackTraceElement[] els = exp.getStackTrace();
for (int i = 0; i < els.length; i++) {
System.err.println("DEBUG>" + els[i].toString());
}
}
}
public Object readObject(Oop oop) throws ClassNotFoundException {
if (oop instanceof Instance) {
return readInstance((Instance) oop);
} else if (oop instanceof TypeArray){
return readPrimitiveArray((TypeArray)oop);
} else if (oop instanceof ObjArray){
return readObjectArray((ObjArray)oop);
} else {
return null;
}
}
protected final Object getDefaultPrimitiveValue(Class clz) {
if (clz == Boolean.TYPE) {
return Boolean.FALSE;
} else if (clz == Character.TYPE) {
return new Character(' ');
} else if (clz == Byte.TYPE) {
return new Byte((byte) 0);
} else if (clz == Short.TYPE) {
return new Short((short) 0);
} else if (clz == Integer.TYPE) {
return new Integer(0);
} else if (clz == Long.TYPE) {
return new Long(0L);
} else if (clz == Float.TYPE) {
return new Float(0.0f);
} else if (clz == Double.TYPE) {
return new Double(0.0);
} else {
throw new RuntimeException("should not reach here!");
}
}
protected String javaLangString;
protected String javaUtilHashtableEntry;
protected String javaUtilHashtable;
protected String javaUtilProperties;
protected String javaLangString() {
if (javaLangString == null) {
javaLangString = "java/lang/String";
}
return javaLangString;
}
protected String javaUtilHashtableEntry() {
if (javaUtilHashtableEntry == null) {
javaUtilHashtableEntry = "java/util/Hashtable$Entry";
}
return javaUtilHashtableEntry;
}
protected String javaUtilHashtable() {
if (javaUtilHashtable == null) {
javaUtilHashtable = "java/util/Hashtable";
}
return javaUtilHashtable;
}
protected String javaUtilProperties() {
if (javaUtilProperties == null) {
javaUtilProperties = "java/util/Properties";
}
return javaUtilProperties;
}
private void setHashtableEntry(java.util.Hashtable p, Oop oop) {
InstanceKlass ik = (InstanceKlass)oop.getKlass();
OopField keyField = (OopField)ik.findField("key", "Ljava/lang/Object;");
OopField valueField = (OopField)ik.findField("value", "Ljava/lang/Object;");
OopField nextField = (OopField)ik.findField("next", "Ljava/util/Hashtable$Entry;");
if (DEBUG) {
if (Assert.ASSERTS_ENABLED) {
Assert.that(ik.getName().equals(javaUtilHashtableEntry()), "Not a Hashtable$Entry?");
Assert.that(keyField != null && valueField != null && nextField != null, "Invalid fields!");
}
}
Object key = null;
Object value = null;
Oop next = null;
try {
key = readObject(keyField.getValue(oop));
value = readObject(valueField.getValue(oop));
next = (Oop)nextField.getValue(oop);
// For Properties, should use setProperty(k, v). Since it only runs in SA
// using put(k, v) should be OK.
p.put(key, value);
if (next != null) {
setHashtableEntry(p, next);
}
} catch (ClassNotFoundException ce) {
if( DEBUG) {
debugPrintln("Class not found " + ce);
debugPrintStackTrace(ce);
}
}
}
private void setPropertiesEntry(java.util.Properties p, Oop oop) {
InstanceKlass ik = (InstanceKlass)oop.getKlass();
OopField keyField = (OopField)ik.findField("key", "Ljava/lang/Object;");
OopField valueField = (OopField)ik.findField("val", "Ljava/lang/Object;");
try {
p.setProperty((String)readObject(keyField.getValue(oop)),
(String)readObject(valueField.getValue(oop)));
} catch (ClassNotFoundException ce) {
if (DEBUG) {
debugPrintStackTrace(ce);
}
}
}
protected Object getHashtable(Instance oop) {
InstanceKlass k = (InstanceKlass)oop.getKlass();
OopField tableField = (OopField)k.findField("table", "[Ljava/util/Hashtable$Entry;");
if (tableField == null) {
debugPrintln("Could not find field of [Ljava/util/Hashtable$Entry;");
return null;
}
java.util.Hashtable table = new java.util.Hashtable();
ObjArray kvs = (ObjArray)tableField.getValue(oop);
long size = kvs.getLength();
debugPrintln("Hashtable$Entry Size = " + size);
for (long i=0; i<size; i++) {
Oop entry = kvs.getObjAt(i);
if (entry != null && entry.isInstance()) {
setHashtableEntry(table, entry);
}
}
return table;
}
private Properties getProperties(Instance oop) {
InstanceKlass k = (InstanceKlass)oop.getKlass();
OopField mapField = (OopField)k.findField("map", "Ljava/util/concurrent/ConcurrentHashMap;");
if (mapField == null) {
debugPrintln("Could not find field of Ljava/util/concurrent/ConcurrentHashMap");
return null;
}
Instance mapObj = (Instance)mapField.getValue(oop);
if (mapObj == null) {
debugPrintln("Could not get map field from java.util.Properties");
return null;
}
InstanceKlass mk = (InstanceKlass)mapObj.getKlass();
OopField tableField = (OopField)mk.findField("table", "[Ljava/util/concurrent/ConcurrentHashMap$Node;");
if (tableField == null) {
debugPrintln("Could not find field of [Ljava/util/concurrent/ConcurrentHashMap$Node");
return null;
}
java.util.Properties props = new java.util.Properties();
ObjArray kvs = (ObjArray)tableField.getValue(mapObj);
long size = kvs.getLength();
debugPrintln("ConcurrentHashMap$Node Size = " + size);
LongStream.range(0, size)
.mapToObj(kvs::getObjAt)
.filter(o -> o != null)
.forEach(o -> setPropertiesEntry(props, o));
return props;
}
public Object readInstance(Instance oop) throws ClassNotFoundException {
Object result = getFromObjTable(oop);
if (result == null) {
InstanceKlass kls = (InstanceKlass) oop.getKlass();
// Handle java.lang.String instances differently. As part of JSR-133, fields of immutable
// classes have been made final. The algorithm below will not be able to read Strings from
// debuggee (can't use reflection to set final fields). But, need to read Strings is very
// important.
// Same for Hashtable, key and hash are final, could not be set in the algorithm too.
// FIXME: need a framework to handle many other special cases.
if (kls.getName().equals(javaLangString())) {
return OopUtilities.stringOopToString(oop);
}
if (kls.getName().equals(javaUtilHashtable())) {
return getHashtable(oop);
}
if (kls.getName().equals(javaUtilProperties())) {
return getProperties(oop);
}
Class clz = readClass(kls);
try {
result = clz.newInstance();
} catch (Exception ex) {
// no-arg constructor failed to create object. Let us try
// to call constructors one-by-one with default arguments
// (null for objects, 0/0.0 etc. for primitives) till we
// succeed or fail on all constructors.
java.lang.reflect.Constructor[] ctrs = clz.getDeclaredConstructors();
for (int n = 0; n < ctrs.length; n++) {
java.lang.reflect.Constructor c = ctrs[n];
Class[] paramTypes = c.getParameterTypes();
Object[] params = new Object[paramTypes.length];
for (int i = 0; i < params.length; i++) {
if (paramTypes[i].isPrimitive()) {
params[i] = getDefaultPrimitiveValue(paramTypes[i]);
}
}
try {
c.setAccessible(true);
result = c.newInstance(params);
break;
} catch (Exception exp) {
if (DEBUG) {
debugPrintln("Can't create object using " + c);
debugPrintStackTrace(exp);
}
}
}
}
if (result != null) {
putIntoObjTable(oop, result);
oop.iterate(new FieldSetter(result), false);
}
}
return result;
}
public Object readPrimitiveArray(final TypeArray array) {
Object result = getFromObjTable(array);
if (result == null) {
int length = (int) array.getLength();
TypeArrayKlass klass = (TypeArrayKlass) array.getKlass();
int type = (int) klass.getElementType();
switch (type) {
case TypeArrayKlass.T_BOOLEAN: {
final boolean[] arrayObj = new boolean[length];
array.iterate(new DefaultOopVisitor() {
public void doBoolean(BooleanField field, boolean isVMField) {
IndexableFieldIdentifier ifd = (IndexableFieldIdentifier) field.getID();
arrayObj[ifd.getIndex()] = field.getValue(array);
}
}, false);
result = arrayObj;
}
break;
case TypeArrayKlass.T_CHAR: {
final char[] arrayObj = new char[length];
array.iterate(new DefaultOopVisitor() {
public void doChar(CharField field, boolean isVMField) {
IndexableFieldIdentifier ifd = (IndexableFieldIdentifier) field.getID();
arrayObj[ifd.getIndex()] = field.getValue(array);
}
}, false);
result = arrayObj;
}
break;
case TypeArrayKlass.T_FLOAT: {
final float[] arrayObj = new float[length];
array.iterate(new DefaultOopVisitor() {
public void doFloat(FloatField field, boolean isVMField) {
IndexableFieldIdentifier ifd = (IndexableFieldIdentifier) field.getID();
arrayObj[ifd.getIndex()] = field.getValue(array);
}
}, false);
result = arrayObj;
}
break;
case TypeArrayKlass.T_DOUBLE: {
final double[] arrayObj = new double[length];
array.iterate(new DefaultOopVisitor() {
public void doDouble(DoubleField field, boolean isVMField) {
IndexableFieldIdentifier ifd = (IndexableFieldIdentifier) field.getID();
arrayObj[ifd.getIndex()] = field.getValue(array);
}
}, false);
result = arrayObj;
}
break;
case TypeArrayKlass.T_BYTE: {
final byte[] arrayObj = new byte[length];
array.iterate(new DefaultOopVisitor() {
public void doByte(ByteField field, boolean isVMField) {
IndexableFieldIdentifier ifd = (IndexableFieldIdentifier) field.getID();
arrayObj[ifd.getIndex()] = field.getValue(array);
}
}, false);
result = arrayObj;
}
break;
case TypeArrayKlass.T_SHORT: {
final short[] arrayObj = new short[length];
array.iterate(new DefaultOopVisitor() {
public void doShort(ShortField field, boolean isVMField) {
IndexableFieldIdentifier ifd = (IndexableFieldIdentifier) field.getID();
arrayObj[ifd.getIndex()] = field.getValue(array);
}
}, false);
result = arrayObj;
}
break;
case TypeArrayKlass.T_INT: {
final int[] arrayObj = new int[length];
array.iterate(new DefaultOopVisitor() {
public void doInt(IntField field, boolean isVMField) {
IndexableFieldIdentifier ifd = (IndexableFieldIdentifier) field.getID();
arrayObj[ifd.getIndex()] = field.getValue(array);
}
}, false);
result = arrayObj;
}
break;
case TypeArrayKlass.T_LONG: {
final long[] arrayObj = new long[length];
array.iterate(new DefaultOopVisitor() {
public void doLong(LongField field, boolean isVMField) {
IndexableFieldIdentifier ifd = (IndexableFieldIdentifier) field.getID();
arrayObj[ifd.getIndex()] = field.getValue(array);
}
}, false);
result = arrayObj;
}
break;
default:
throw new RuntimeException("should not reach here!");
}
putIntoObjTable(array, result);
}
return result;
}
protected final boolean isRobust(OopHandle handle) {
return RobustOopDeterminator.oopLooksValid(handle);
}
public Object readObjectArray(final ObjArray array) throws ClassNotFoundException {
Object result = getFromObjTable(array);
if (result == null) {
int length = (int) array.getLength();
ObjArrayKlass klass = (ObjArrayKlass) array.getKlass();
Klass bottomKls = klass.getBottomKlass();
Class bottomCls = null;
final int dimension = (int) klass.getDimension();
int[] dimArray = null;
if (bottomKls instanceof InstanceKlass) {
bottomCls = readClass((InstanceKlass) bottomKls);
dimArray = new int[dimension];
} else { // instanceof TypeArrayKlass
TypeArrayKlass botKls = (TypeArrayKlass) bottomKls;
dimArray = new int[dimension -1];
}
// initialize the length
dimArray[0] = length;
final Object[] arrayObj = (Object[]) java.lang.reflect.Array.newInstance(bottomCls, dimArray);
putIntoObjTable(array, arrayObj);
result = arrayObj;
array.iterate(new DefaultOopVisitor() {
public void doOop(OopField field, boolean isVMField) {
OopHandle handle = field.getValueAsOopHandle(getObj());
if (! isRobust(handle)) {
return;
}
IndexableFieldIdentifier ifd = (IndexableFieldIdentifier) field.getID();
try {
arrayObj[ifd.getIndex()] = readObject(field.getValue(getObj()));
} catch (Exception e) {
if (DEBUG) {
debugPrintln("Array element set failed for " + ifd);
debugPrintStackTrace(e);
}
}
}
}, false);
}
return result;
}
protected class FieldSetter extends DefaultOopVisitor {
protected Object obj;
public FieldSetter(Object obj) {
this.obj = obj;
}
private void printFieldSetError(java.lang.reflect.Field f, Exception ex) {
if (DEBUG) {
if (f != null) debugPrintln("Field set failed for " + f);
debugPrintStackTrace(ex);
}
}
// Callback methods for each field type in an object
public void doOop(OopField field, boolean isVMField) {
OopHandle handle = field.getValueAsOopHandle(getObj());
if (! isRobust(handle) ) {
return;
}
java.lang.reflect.Field f = null;
try {
f = readField(field);
if (Modifier.isFinal(f.getModifiers())) return;
f.setAccessible(true);
f.set(obj, readObject(field.getValue(getObj())));
} catch (Exception ex) {
printFieldSetError(f, ex);
}
}
public void doByte(ByteField field, boolean isVMField) {
java.lang.reflect.Field f = null;
try {
f = readField(field);
if (Modifier.isFinal(f.getModifiers())) return;
f.setAccessible(true);
f.setByte(obj, field.getValue(getObj()));
} catch (Exception ex) {
printFieldSetError(f, ex);
}
}
public void doChar(CharField field, boolean isVMField) {
java.lang.reflect.Field f = null;
try {
f = readField(field);
if (Modifier.isFinal(f.getModifiers())) return;
f.setAccessible(true);
f.setChar(obj, field.getValue(getObj()));
} catch (Exception ex) {
printFieldSetError(f, ex);
}
}
public void doBoolean(BooleanField field, boolean isVMField) {
java.lang.reflect.Field f = null;
try {
f = readField(field);
if (Modifier.isFinal(f.getModifiers())) return;
f.setAccessible(true);
f.setBoolean(obj, field.getValue(getObj()));
} catch (Exception ex) {
printFieldSetError(f, ex);
}
}
public void doShort(ShortField field, boolean isVMField) {
java.lang.reflect.Field f = null;
try {
f = readField(field);
if (Modifier.isFinal(f.getModifiers())) return;
f.setAccessible(true);
f.setShort(obj, field.getValue(getObj()));
} catch (Exception ex) {
printFieldSetError(f, ex);
}
}
public void doInt(IntField field, boolean isVMField) {
java.lang.reflect.Field f = null;
try {
f = readField(field);
if (Modifier.isFinal(f.getModifiers())) return;
f.setAccessible(true);
f.setInt(obj, field.getValue(getObj()));
} catch (Exception ex) {
printFieldSetError(f, ex);
}
}
public void doLong(LongField field, boolean isVMField) {
java.lang.reflect.Field f = null;
try {
f = readField(field);
if (Modifier.isFinal(f.getModifiers())) return;
f.setAccessible(true);
f.setLong(obj, field.getValue(getObj()));
} catch (Exception ex) {
printFieldSetError(f, ex);
}
}
public void doFloat(FloatField field, boolean isVMField) {
java.lang.reflect.Field f = null;
try {
f = readField(field);
if (Modifier.isFinal(f.getModifiers())) return;
f.setAccessible(true);
f.setFloat(obj, field.getValue(getObj()));
} catch (Exception ex) {
printFieldSetError(f, ex);
}
}
public void doDouble(DoubleField field, boolean isVMField) {
java.lang.reflect.Field f = null;
try {
f = readField(field);
if (Modifier.isFinal(f.getModifiers())) return;
f.setAccessible(true);
f.setDouble(obj, field.getValue(getObj()));
} catch (Exception ex) {
printFieldSetError(f, ex);
}
}
public void doCInt(CIntField field, boolean isVMField) {
throw new RuntimeException("should not reach here!");
}
}
public Class readClass(InstanceKlass kls) throws ClassNotFoundException {
Class cls = (Class) getFromObjTable(kls);
if (cls == null) {
cls = Class.forName(kls.getName().asString().replace('/', '.'), true, cl);
putIntoObjTable(kls, cls);
}
return cls;
}
public Object readMethodOrConstructor(sun.jvm.hotspot.oops.Method m)
throws NoSuchMethodException, ClassNotFoundException {
String name = m.getName().asString();
if (name.equals("<init>")) {
return readConstructor(m);
} else {
return readMethod(m);
}
}
public java.lang.reflect.Method readMethod(sun.jvm.hotspot.oops.Method m)
throws NoSuchMethodException, ClassNotFoundException {
java.lang.reflect.Method result = (java.lang.reflect.Method) getFromObjTable(m);
if (result == null) {
Class clz = readClass((InstanceKlass)m.getMethodHolder());
String name = m.getName().asString();
Class[] paramTypes = getParamTypes(m.getSignature());
result = clz.getMethod(name, paramTypes);
putIntoObjTable(m, result);
}
return result;
}
public java.lang.reflect.Constructor readConstructor(sun.jvm.hotspot.oops.Method m)
throws NoSuchMethodException, ClassNotFoundException {
java.lang.reflect.Constructor result = (java.lang.reflect.Constructor) getFromObjTable(m);
if (result == null) {
Class clz = readClass((InstanceKlass)m.getMethodHolder());
String name = m.getName().asString();
Class[] paramTypes = getParamTypes(m.getSignature());
result = clz.getDeclaredConstructor(paramTypes);
putIntoObjTable(m, result);
}
return result;
}
public java.lang.reflect.Field readField(sun.jvm.hotspot.oops.Field f)
throws NoSuchFieldException, ClassNotFoundException {
java.lang.reflect.Field result = (java.lang.reflect.Field) fieldMap.get(f);
if (result == null) {
FieldIdentifier fieldId = f.getID();
Class clz = readClass((InstanceKlass) f.getFieldHolder());
String name = fieldId.getName();
try {
result = clz.getField(name);
} catch (NoSuchFieldException nsfe) {
result = clz.getDeclaredField(name);
}
fieldMap.put(f, result);
}
return result;
}
protected final ClassLoader cl;
protected Map oopToObjMap; // Map<Oop, Object>
protected Map fieldMap; // Map<sun.jvm.hotspot.oops.Field, java.lang.reflect.Field>
protected void putIntoObjTable(Oop oop, Object obj) {
oopToObjMap.put(oop, obj);
}
protected Object getFromObjTable(Oop oop) {
return oopToObjMap.get(oop);
}
protected void putIntoObjTable(Metadata oop, Object obj) {
oopToObjMap.put(oop, obj);
}
protected Object getFromObjTable(Metadata oop) {
return oopToObjMap.get(oop);
}
protected class SignatureParser extends SignatureIterator {
protected Vector tmp = new Vector(); // Vector<Class>
public SignatureParser(Symbol s) {
super(s);
}
public void doBool () { tmp.add(Boolean.TYPE); }
public void doChar () { tmp.add(Character.TYPE); }
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